I've used crimson red RIT on AK47 furniture before. Gives it a nice "Russian Red" look, especially if you use a matte clear minwax poly on it.
I've never heard of anyone using chocolate mix in with the dye though. Is that what the rough texture in several places of the grip is? It may smooth out if you go over the entire piece with steel wool between your coats.
The final coat though, I would probably strain it out before the final coat of polyurethane.
The forend looks really nice. Almost gives it a cherry wood look, which is going to contrast nicely with the gun.